Bulls**t
My wife is young enough to be my daughter, (17 year difference), and we have plenty in common. Thankfully she's sponsoring me so we don't have to deal with nearly as much hassle over it as we would if the ages were reversed.
It may surprise you but it's quite possible to have similar tastes in entertainment and hobbies despite an age gap. Of course there's differences but we have a wide overlap in our tastes in music and movies enough tolerance of each other's tastes to deal with our difference. We go to plenty of concerts together, I'm not going to complain if she goes with friends to see some rapper for example.
And when it comes to one's core beliefs, (ethics, religion, politics, etc), you believe what you believe regardless of age. One can be religious or not, have conservative or liberal political views, etc regardless of their age. Whether or not you share those beliefs is not related to your age. And I particularly find "What do they plan to do regarding starting a family?" annoying. Has it never occurred to you that there are plenty of couples, (of all ages), who don't want to start a family?